Question

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Answer 1

Do you have an idea on how to isolate b?

Answer 2

Sure you can do that
\(\sqrt{d}=\sqrt{b^2}-4ac\\
\sqrt{d}=b-4ac\)
Do you know what to do next?

Answer 3

So you are subtracting 4ac from b
What is the opposite of subtraction?

Answer 4

Right so we add 4ac on both sides
\(\sqrt{d} \color{red}{+4ac}=b−4ac \color{red}{+4ac}\\
\sqrt{d+4ac}=b \checkmark\)

Answer 5

Right

Answer 6

:D